Error Code E103

[ENadboralski]

Recently my Nest thermostat has started giving me the E103 error. Nothing has changed with thermostat or equipment in over a year. It has been consistantly working for well over a month. And then it stopped, and gave this error. After a lot of messing around it finally started working again when we just physically turned off the firnace, and switched it back on. Fast forward 2 weeks and its erroring again. This time nothing is working.

We have reset the thermostat. We have turned the furnace on and off. We have reset the breaker. Still nothing.

Not sure what else to do? Very unlikely to be the AC unit since this keeps randomly happening and the AC works fine in between... 

[Patrick_Caezza]

The E103 error means there is an over-current condition on the yellow (Y1) wire.

This usually means that there is a relay in the Heat Pump Unit that is going bad. 

[Ryan_G]

Hi ENadboralski,

Thanks for reaching out here in the community.

I'd like to jump in here and check if you've seen Patrick_Caezza's response about checking the relay from the heat pump.

Let us know how it goes by  replying to this thread.

Thank you for your assistance, Patrick_Caezza.

Best regards,

Ryan

[Ryan_G]

Hey ENadboralski,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

Best regards,

Ryan

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.

Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,

Ryan